Low-Phase-Aberration Output of 830 nm AlGaAs Offset-Coupled Laser Arrays

Phase-locked lasers with refractive-index waveguides have been developed. The elemental stripes of the laser are evanescently and offset coupled. A fundamental supermode operation in the 2/3-element laser arrays is achieved. The phase aberration is less than λ/14 (λ=830 nm). The output power of the laser array increases almost linearly up to 200 mW with an external differential slope efficiency of 0.75 W/A.